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Port Jackson is the natural harbour of Sydney, Australia, also known as Sydney Harbour. It is the largest natural harbour in the world. It is a prime piece of real estate in Sydney today. Its best known features are the Sydney Opera House and Sydney Harbour Bridge.
The harbour was discovered and named by Lt. James Cook in 1770, although he did not enter it. It is named after Sir George Jackson, Judge Advocate of the Fleet at the time. Cook noted "there appears to be a good anchorage" in his log. Captain Arthur Phillip established the first colony in Australia at Sydney Cove inside Port Jackson in 1788. That colony grew to become Sydney.
Geologically, Port Jackson is a drowned river valley. It is 19 km long with an area of 55 sq km.